Liquid fuel injector



Feb. 12, 1952 c. 'r. YOUNG LIQUID FUEL INJECTOR Filed Aug. 14, 1947 FIG. 3.

FIG. 2.

INVEN TOR CARL 7. YOUNG @"QW;

ATTORNEY Patented Feb. 12, 1952 LIQUID FUEL INJECTOR Carl T. Young,.Silver Spring, Md., assignor to the Unitedstatesof America as representedby the Secretary of'the Navy Application-August 14, 1947, SeriaI.N0. '768,693

4 Claims. (Cl. 261-76) 1 This invention 'relates to improvements in let propulsion motors and 'is particularlyldirect'ed to an;-improved liquid fuel injector designedto be used as an atomizerfor'the formation, of

continuous fuel charge which, .chargewor fuel mixture is created .in a constant :stream under pressure of fuel air.

The principal :object of the present invention is to provide a jet propulsion motor with a li uid fuel motor designed to eject the liquid fuel in athin, wide sheet of film of such consistency that a passing current or stream of fuel air willreadily combine, with. and convert the atomized liquid into an effective fuel mixture prior to ad-.

mission into the combustion chamber- 0f the motor.

A further object of the present inventionis to provide a jet motor with a group or series of injectors mounted in the fuel mixing chamber, or

feed duct, in order that the finely atomized liquid fuel-may be uniformly distributed over a wide area forthorough commingling with the'fuel air flowing under pressure through the mixing chamber.

A still further object of the invention is to provide an atomizer for use in a jet motor of simple and rugged construction, which may be readily manufactured in large quantities and easily in? stalled; whose operation can constantly be relied upon, and which is both durable and effective in use.

Still further objects, advantages, and improvements will be evident from the following description of the invention taken in connection with the accompanying drawings in which:

Fig. 1 is an end view of a device embodyin the present invention.

Fig. 2 is a longitudinal section thereof talten' along 2-2 of Fig. 1.

Fig. 3 is a fragmentary sectional view showing in detail a portion of the full distribution chain'- ber and the relation thereto of one of the injectors.

Fig. 4 is an end view of an injector element, and

Fig. 5 is a sectional view taken along 5-5 in Fig. 3.

Referring now to the drawings on which like numerals of reference are employed to designate like parts throughout the several views, and more particularly to Figs. 1 and 2 thereof, there" is shown a portion of an improved jet motor .indicated by the numeral l consisting of a pair of cylindrical members 2, 2' secured to the respective ends of a sleeve 3 to form a mixing chamberx i. The sleeve 3 is constructed in twosections 5 and 6, said sections having oppositelyrecessed wall portions 1- and ii respectively, said recessed wall portions being designed to overlap to form an annularfuelwchamber.9. :A fuel supplypipe I0 is connected to the wall 8 and'communicates with'thezfuel chamber 9.

On the insidev wall of the section 5 there is. a plurality .of fuel injectors .or atomizers ell symmetrically mounted. As can be noted, the injectors H are streamlined in shape so as to offer a minimum of resistanceto the flow of aim-and each issecured-to the'wall l by a respective stud or post. i 5 and ;:by being welded thereto.

Each of the :injectors H is bifurcated at its taperedend, and Mean inlet port in the :form of atransverseduct i2 threadedat one end-to receive a nipple 13 which connectsthe annular chamber-9 with alon gitudinally disposelzl outlet portvor discharge; duct 14. The gdischargeeor 'atomizingl-effect of the liquid fuelcis caused-by a narrow-slot. 16 having a baffle'plate I '7 secured at the mouth of the duct [4 by a bolt i8 which extends through the duct [4 and is threaded into the body of the injector II. The discharged liquid fuel forms two lateral sprays, mixing with the air as it flows through the mixing chamber 4 and into the combustion chamber (not shown). A tapped port l9 provides a source of fluid pressure taken from the forward portion of the mixing chamber for auxiliary purposes.

In the operation of the jet motor I that includes the present device, the fuel, introduced under pressure, through pipe I 0, into the annular chamber 9, is discharged into the mixing chamber 4, from both ends of the narrow slot l6 formed between a rear surface of the injector H and the adjacent front surface of the bafile IT. This structure directs the flow of fuel into two thin sheets, flowing in opposite directions and substantially at right angles to the length of the injector. However, at its point of exit from the slot, each sheet of liquid fuel meets the high velocity air stream, normally flowing through the jet motor, tangentially to the outer surface of the injector, and thereby is sharply deflected to the rear and simultaneously atomized and mixed with said air. The mixture of fuel and air then flows into the combustion chamber, where it is ignited and burned to energize the jet motor.

While the invention has been described with reference to a certain preferred example thereof which gives satisfactory results, it will be understood by those skilled in the art to which the invention pertains, after understanding the invention, that various changes and modifications may be made without departin from the spirit and scope of the invention, and it is intended, therefore, to cover in the appended claims all such changes and modifications.

What is claimed is:

1. A streamlined liquid fuel injector, bifurcated at its rear end, there being a fuel duct within said injector, opening between the furcations thereof to form an outlet port for the fuel, said. injector having a transverse slot in communication with said port and forming continuations of said fuel duct, a baflle plate mounted over said slot to form therewith a pair of oppositely opening fuel discharge ports, and means for securing said baffle plate to said injector.

2. In a jet motor, a tubular member, constituting a mixing chamber, said tubular member having a fuel container within its wall, a fuel inlet pipe affording a connection to said container from outside the member, and a plurality of elongated fuel injectors secured to the inside Wall of said member, and each extending in the direc- 'tion of the longitudinal axis of the motor, each injector having a fuel passage connecting it to the container, each such passage terminating in anarrow slot directed transversely of the injectorand open at both ends to discharge fuel at the outer surface of the injector, Within said mixing chamber.

3. In a jet motor, a mixing chamber comprising a first tubular member having a recessed wall portion extending therefrom, a second tubular member having an extending wall portion recessed oppositely to the wall portion of said first tubular member, said first and second tubular members being assembled coaxially whereby said oppositely recessed wall portions overlap to form an annular fuel duct, a plurality of elongated injectors mounted within said assembled tubular i members with their longitudinal axes parallel to the axis of said tubular members, each of said elongated injectors comprising a longitudinally streamlined body member having a bifurcated end, there being a conduit in each body member communicating with .the fuel duct and terminating between the furcations to form an outlet port at said bifurcated end, each said body member having a transverse slot adjacent said outlet port, and a baflle plate mounted on each said body member to cover said outlet port and form with said slot a pair of oppositely and laterally directed ports.

4. In a jet motor, a mixing chamber comprising a first tubular member having integral therewith a longitudinally extending recessed wall portion, a second tubular member having integral REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,232,506 Costa July 10, 1917 1,242,089 Walker Oct. 2, 1917 FOREIGN PATENTS Number Country Date 5,100 Great Britain 1913 221,638 Great Britain Sept. 18, 1924 

